The studies examined the health histories of hundreds of thousands of people who were tracked over many years. They found that coffee-drinking reduced the risk of various diseases among people from several ethnicities, and this effect was seen in drinkers of regular or decaffeinated coffee. And the more coffee consumed, the greater the benefit.

One study was by the University of Southern California and funded by the National Cancer Institute. They actually examined the coffee-drinking habits of more than 180,000 whites, African-Americans, Latinos, Japanese-Americans and native Hawaiians. They study was so long they actually followed these people for an average of 16 years. They stated the following:

Drinking coffee was associated with a lower risk of death due to heart disease, cancer, stroke, diabetes, and respiratory and kidney disease for African-Americans, Japanese-Americans, Latinos and whites.

Both of the new studies were published in the Annals of Internal Medicine.